US8503942B2 - Network controlled E-UTRAN neighbor cell measurements - Google Patents

Network controlled E-UTRAN neighbor cell measurements Download PDF

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Publication number
US8503942B2
US8503942B2 US12/525,845 US52584508A US8503942B2 US 8503942 B2 US8503942 B2 US 8503942B2 US 52584508 A US52584508 A US 52584508A US 8503942 B2 US8503942 B2 US 8503942B2
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measurements
bandwidth
neighbor cells
user equipment
measurement bandwidth
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US20100323688A1 (en
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Muhammad Ali Kazmi
Anders Furuskär
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to methods and arrangements in a telecommunication system, in particular to methods and arrangements for network-controlled bandwidth for neighbor cell measurements.
  • E-UTRAN E-UTRAN system
  • cell transmission bandwidths e.g. 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, etc.
  • UE user equipment
  • Mobility support is one of the fundamental features of any cellular systems.
  • E-UTRAN the mobility has to be supported both in idle mode and in connected mode.
  • idle mode the UE in E-UTRAN shall do autonomous cell reselection based on some network signaled parameters. This allows the network to control UE mobility behavior in the coverage area to some extent.
  • the UE shall be able to do cell reselection within the same frequency layer (intra frequency cell reselection), between different frequency layers (inter-frequency cell reselection), and also between E-UTRAN and other systems such as UTRAN (inter-RAT cell reselection).
  • intra frequency cell reselection between different frequency layers
  • inter-RAT cell reselection between E-UTRAN and other systems
  • the network In connected mode the network shall direct the UE to perform handover to a particular cell. Though this decision is taken by the network it is generally based on UE measurement reports.
  • the UE in connected mode shall also support mobility (i.e. handovers) within the same frequency layer, inter-frequency handovers and inter-RAT handovers.
  • the cell reselection and handovers are generally based on one or more downlink measurements. These measurements are typically done on some known reference symbols or pilot sequences.
  • Another important aspect of the mobility is the identification of the UE position or geographical location. This allows the UE to get an access to location based services, e.g. map reading. There are several different types of positioning methods. In some of the methods the UE identifies its location based on one or more neighbor cell measurements that are also done on some known channel or pilot sequences.
  • a neighbor cell measurement is a measurement performed by a UE in serving cell(s) as well as neighbor cells on some known downlink reference symbols or pilot sequences. Unlike other measurements, such as CQI which is done on Transmission Time Interval (TTI) level (e.g. 1 ms), neighbor cell measurements are performed over longer time duration in the order of few 100 ms.
  • TTI Transmission Time Interval
  • the neighbor cell measurements can be broadly divided into two main categories:
  • the radio-related measurements are used to take handover decisions and allow UE to do cell reselection in idle mode.
  • a good mobility procedure requires generally more than one measurement since one measurement alone cannot cover all the aspects and criteria. For instance both coverage and load in the cell should impact the cell change decision.
  • the measurements are performed on the reference symbols that are sent with a certain pattern defined in time and frequency. This pattern is repeated every TTI (i.e. 1 ms).
  • RS-RSSI (or RSRP) is measured over the downlink reference symbol, whereas carrier RSSI is measured over the entire UE reception bandwidth. Furthermore, RSRP is measured per cell whereas carrier RSSI is measured per carrier frequency.
  • Timing-related measurements are used for time alignment purposes during handover.
  • An example would be the time difference between the reference signals from the serving and target cells.
  • other timing-related measurements could be used for positioning.
  • An example is the time difference between the broadcast channel (BCH) from the serving and non-serving cells.
  • BCH broadcast channel
  • All the neighbor cell measurements are performed over a certain bandwidth.
  • these types of measurements are done over the entire cell bandwidth.
  • a physical channel is sent over one signal bandwidth in all cells, e.g. 200 kHz in GSM and 5 MHz in WCDMA.
  • E-UTRAN different cell transmission bandwidths is possible. Therefore an efficient mechanism is needed to get consistent UE reports from different cells even if they operate with different bandwidths.
  • the network may also instruct the user equipment how to report measurement results.
  • the invention also extends to a node, such as a radio base station, of a mobile telecommunications system configured to signal the bandwidth over which the user equipment shall perform the neighbor cell measurements.
  • the node may also be configured to instruct the user equipment how to report the measurement results.
  • the invention further extends to a user equipment configured to receive measurement configuration information from a radio base station. Using the configuration information the user equipment is adapted to acquire measurement bandwidth information from the serving cell over which the measurement is to be performed, performing measurements of the neighbor cells over the acquired measurement bandwidth, and report measurements to the network.
  • FIG. 1 is a general view of a cellular radio system
  • FIG. 2 is a flow chart illustrating steps performed when transmitting configuration instructions to a User equipment
  • FIG. 3 is a flow chart illustrating steps performed when performing measurements in a user equipment.
  • a first proposal relates to a fixed, such as 1.4 MHz, bandwidth.
  • the idea is to limit the measurement bandwidth to the center sub-carriers (e.g. 72 for 1.4 MHz) irrespective of the cell transmission bandwidth. This means even for a cell employing 20 MHz, the measurement bandwidth would be limited to 1.4 MHz if that is used. Though this simplifies UE implementation, it, however, implies the problem that the measurement does not reflect the radio situation over the wider bandwidth. This means that a cell with larger bandwidth cannot benefit from having more reliable neighbor cell measurements in terms of radio properties.
  • a second proposal relates to a measurement bandwidth that equals the cell bandwidth.
  • the idea is to use the state of the art method of performing the neighbor cell measurements over the entire cell transmission bandwidth. This is attractive in the sense that the measurement reflects the radio performance over the entire cell bandwidth.
  • the UE needs to read the system information (i.e. BCH) of every neighbor cell to acquire the bandwidth of that cell.
  • the BCH reading may lead to additional delay, processing (power consumption) and implementation complexity in the UE.
  • Border areas between different deployments Irrespective of the fact whether all cells have the same bandwidths (homogeneous cells) or different bandwidths (heterogeneous cells) in a geographical area, there will be border areas where cells of different bandwidths coincide.
  • FIG. 1 a mobile telecommunication system 100 is shown.
  • the system 100 comprises a number of radio base stations 101 , whereof only one is shown for reasons of simplicity.
  • the system 100 is configured to signal measurement bandwidth values to a User Equipment 103 connected to the network 100 .
  • the signaling to the UE can be performed via an appropriate network unit 105 in the serving cell, which can be located in the Radio Base Station 101 .
  • the UE 103 uses the signal values to perform one or more downlink measurements on the serving as well as the neighbor cells.
  • the signaled measurement bandwidth could be the minimum of the bandwidths in all cells.
  • the UE does not have to read system information of the neighbor cells to acquire their bandwidths for doing neighbor cell measurements. This reduces both complexity in UE and also reduces measurement reporting delay.
  • the bandwidth of the neighbor cell measurements is controlled by the network and, therefore, varies in accordance with the bandwidth deployment scenario.
  • the network is aware of the deployment scenario, i.e. cell bandwidth(s) used in the coverage area or in a particular geographical location.
  • Preferably network sets one single bandwidth over which the UE shall measure all the neighbor cells.
  • FIG. 2 a flow chart illustrating some steps performed in a radio base station when executing command of the measurements performed by the user equipment are shown.
  • the radio base station signals the measurement bandwidth over which the user equipment shall perform the neighbor cell measurements.
  • the radio base station transmits a message instructing the user equipment how to report the measurement results.
  • FIG. 3 a flow chart illustrating steps performed in a user equipment when receiving measurement commands from a radio base station are shown.
  • the UE receives measurement configuration information from a radio base station.
  • the UE acquires measurement bandwidth information from the serving cell over which a measurement is to be performed.
  • the UE performs measurements of neighbor cells over the acquired measurement bandwidth.
  • the UE reports the measurements to the network.
  • any bandwidth is possible that is an integer multiple of the available sub-carriers.
  • it can be sufficient to limit the measurement bandwidths to all possible available bandwidths i.e. 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and so on.
  • the network can signal the measurement bandwidth as the minimum of all cells' bandwidths deployed in a coverage area.
  • the network can signal any suitable measurement bandwidth parameter that would ensure that UE measurements done according to this parameters are consistent from different cells.
  • the UE shall perform the neighbor cell measurement over the same number of sub-carriers irrespective of the cell bandwidths.
  • the UE is able to report measurements that would be consistent since same measurement bandwidth is set by the network for all the cells.
  • the UE does not have to read the system information of the neighbor cells to acquire the cell bandwidth prior to do neighbor cell measurement.
  • the measurement bandwidth can be signaled by the serving cell to the UE.
  • the UE In idle mode the UE can be informed about the measurement bandwidth via the system information i.e. BCH sent from the serving cell.
  • the serving cell In connected mode the serving cell can signal the measurement bandwidth via a shared channel to the UE. This will, on the one hand reduce UE complexity in terms of acquiring bandwidth of each cell and, on the other hand, provide more flexibility to the network in terms of making use of larger measurement bandwidth whenever possible according to the deployment scenario.
  • the first step in the measurement procedure is the cell identification, which is followed by the actual measurement and eventually reporting the measurement results to the network.
  • the UE will first acquire a cell group identity (ID), which is mapped on the synchronization channel (SCH).
  • ID the SCH occupies only the central 72 sub-carriers (i.e. SCH bandwidth is limited to 1.4 MHz).
  • the UE shall identify the cell ID, which is mapped on the reference symbols. It is possible for the UE to find the cell ID by demodulating only the reference symbols in the central 1.25 MHz for all bandwidths.
  • the network-controlled bandwidth does not require the UE to know the actual bandwidth of the cell for the purpose of identifying a cell (i.e. cell ID acquisition), which implies that the UE can perform measurement on all the cells (serving and neighbors) over the network signaled bandwidth without reading system information of the neighbor cells.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
US12/525,845 2007-02-05 2008-02-04 Network controlled E-UTRAN neighbor cell measurements Active 2029-03-17 US8503942B2 (en)

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SE0700286 2007-02-05
SE0700286 2007-02-05
SE0700286-8 2007-02-05
PCT/SE2008/050138 WO2008097185A2 (en) 2007-02-05 2008-02-04 Network-controlled e-utran neighbour cell measurements

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US14/810,075 Active 2029-05-09 US10779169B2 (en) 2007-02-05 2015-07-27 Network controlled E-UTRAN neighbor cell measurements
US16/991,471 Active US11496911B2 (en) 2007-02-05 2020-08-12 Network-controlled E-UTRAN neighbor cell measurements
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US16/991,471 Active US11496911B2 (en) 2007-02-05 2020-08-12 Network-controlled E-UTRAN neighbor cell measurements
US17/951,355 Pending US20230011833A1 (en) 2007-02-05 2022-09-23 Network-Controlled E-UTRAN Neighbor Cell Measurements

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